An ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device

Abstract

This invention provides an ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device, belonging to the field of ball valve technology. It includes a valve body and a valve cover connected together. A first cooling channel is provided inside the valve body, and a second cooling channel is provided inside the valve cover. A first sealing element is provided between the valve body and the valve cover, and a first channel is provided on the first sealing element. An inlet flange is provided on the valve body, and an outlet flange is provided on the valve cover. The inlet flange, the first cooling channel, the first channel, the second cooling channel, and the outlet flange are sequentially connected to form a cooling circuit. This invention can effectively reduce the temperature of the valve body and key sealing parts through the cooling circuit while maintaining the original valve connection dimensions, thereby significantly improving the sealing reliability and long-term safety performance of the valve in ultra-high temperature environments. It solves the problem in existing technologies where external insulation jackets cannot effectively cool the internal sealing elements to achieve long-term safe use under ultra-high temperature media conditions.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, and specifically to an ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device. Background Technology

[0002] With the development of industrial technology, coal chemical gasification processes have achieved new breakthroughs. A successful industrial trial of biomass-coal co-gasification has been conducted in China. This process directly processes biomass raw materials such as straw, wood, and garden waste into biomass powder suitable for processing. This powder is then pneumatically conveyed into a pressurized gasifier, where it is efficiently converted into high-quality syngas. This provides a "green channel" for the efficient conversion and utilization of biomass waste and opens up new avenues for carbon reduction in existing coal gasification plants. However, the co-firing process in this new biomass gasification device generates a large amount of heat, reaching temperatures as high as 800℃. To ensure the smooth operation and safety of the process, a valve capable of withstanding 800℃ is necessary for control.

[0003] In the industry, the highest temperature of high-temperature valves is generally defined as 650℃, and in actual applications there are valves that reach 700℃ in some places. However, ultra-high temperature media temperatures of up to 800℃ pose new challenges for valve design and manufacturing.

[0004] High-temperature valves are generally made of high-temperature alloy steel or austenitic stainless steel. For conventional high-temperature alloy steel, 650℃ is its limit; while for austenitic stainless steel, specially formulated high-temperature stainless steel has a maximum temperature resistance of 816℃. For valves with extremely high safety requirements, it is obviously necessary to adopt new methods to improve their long-term safety.

[0005] To address this international industry challenge, some foreign companies have used a jacketed cooling system with external cooling water to cool the valve body. However, this method necessitates increasing the original flange size, significantly increasing valve dimensions and costs. Furthermore, this approach fails to cool the seals between the valve body, bonnet, and other connecting components, thus failing to resolve the issue of external leakage at high temperatures and ultimately not addressing the fundamental problem. Therefore, there is an urgent need for a ball valve that can operate normally for extended periods at ultra-high temperatures of 800°C while maintaining its original installation and dimensional specifications. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device.

[0007] The technical solution adopted by this invention is as follows: This application provides an ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device, including a valve body and a valve cover connected together. A first cooling channel is provided in the valve body, and a second cooling channel is provided in the valve cover. A first sealing element is provided between the valve body and the valve cover. A first channel is provided on the first sealing element to connect the first cooling channel and the second cooling channel. An inlet flange connected to the first cooling channel is provided on the valve body, and an outlet flange connected to the second cooling channel is provided on the valve cover. The inlet flange, the first cooling channel, the first channel, the second cooling channel, and the outlet flange are sequentially connected to form a cooling circuit.

[0008] In some embodiments, the valve body is provided with an inlet channel, the valve cover is provided with an outlet channel, the inlet channel is provided with an inlet heat insulation sleeve, and an inlet chamber communicating with a first cooling flow channel is formed between the two, and the outlet channel is provided with an outlet heat insulation sleeve, and an outlet chamber communicating with a second cooling flow channel is formed between the two.

[0009] In some embodiments, a first annular groove is provided at the inlet channel of the valve body, and a second annular groove is provided at the outlet channel of the valve cover. The two sides of the inlet heat insulation sleeve and the two sides of the first annular groove are welded together to form a seal, and the two sides of the outlet heat insulation sleeve and the two sides of the second annular groove are welded together to form a seal.

[0010] In some embodiments, a pressure cap connected to the valve body is further included, a second sealing element is provided between the pressure cap and the valve body, a third cooling channel is provided on the pressure cap along its axial direction, and a second channel is provided on the second sealing element, the second channel being used to connect the first cooling channel and the third cooling channel and the second cooling channel and the third cooling channel.

[0011] In some embodiments, the valve body has a first annular groove communicating with a first cooling channel on the connection side facing the valve cover, and the valve cover has a second annular groove communicating with a second cooling channel on the connection side facing the valve body.

[0012] In some embodiments, the valve body is provided with a third annular groove communicating with the first cooling channel on the connection side facing the gland, and the gland is provided with a fourth annular groove communicating with the third cooling channel on the connection side facing the valve body.

[0013] In some embodiments, both the first and second seals include a sealing ring portion and a flange portion formed by the outer and inner rings of the sealing ring portion. The two sides of the sealing ring portion are provided as conical or spherical surfaces. The first annular groove, the second annular groove, the third annular groove, and the fourth annular groove are all mated to form an installation cavity adapted to the sealing ring portion and form a line seal therewith. The flange portion abuts against the valve body and the valve cover or between the valve body and the gland.

[0014] In some embodiments, an inlet valve seat assembly disposed within the valve body is further included. The inlet valve seat assembly includes an inlet valve seat, a protective ring, and a disc spring. The protective ring is disposed between the circumferential outer wall of the inlet valve seat and the circumferential inner wall of the valve body. A first sealing plane is provided at the end of the inlet valve seat away from the valve cover. A second sealing plane is provided on the valve body corresponding to the first sealing plane. The disc spring abuts between the valve body and the inlet valve seat and is located on the inner ring of the first sealing plane and the second sealing plane. A certain gap is provided between the circumferential outer wall of the inlet valve seat and the circumferential inner wall of the valve body.

[0015] In some embodiments, an outlet valve seat assembly disposed within the valve cover is further included. The outlet valve seat assembly includes a fixed valve seat, a pressure plate, and a screw. The pressure plate presses against the fixed valve seat, and the screw passes through the pressure plate to fix the fixed valve seat to the valve cover. Its head is welded to the pressure plate. The end of the fixed valve seat away from the valve body is provided with a third sealing plane, and the valve cover is provided with a fourth sealing plane that seals with the third sealing plane.

[0016] In some embodiments, the valve cover is provided with a drain screw sleeve communicating with the second cooling channel, the drain screw sleeve is internally threaded with a screw plug, and a gasket is provided between the screw plug and the drain screw sleeve.

[0017] The beneficial effects of the present invention are as follows: The present invention can form an internal cooling circuit between the valve body, valve cover and seal, which effectively reduces the temperature of the valve body and key sealing parts, thereby significantly improving the sealing reliability and service life of the valve in ultra-high temperature environment, and solving the problem that the external cooling method in the prior art cannot effectively cool the seal. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of an ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to the present invention;

[0020] Figure 2 This is a cross-sectional view of the inlet channel side in this invention;

[0021] Figure 3 This is a cross-sectional view of the outlet channel side in this invention;

[0022] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 5 for Figure 1 Enlarged view of point B in the middle;

[0024] Figure 6 for Figure 1 Enlarged view of point C in the middle;

[0025] Figure 7 for Figure 1 Enlarged view of point D in the middle;

[0026] Figure 8 This is a three-dimensional schematic diagram of the valve cover in this invention;

[0027] Figure 9 This is a three-dimensional schematic diagram of the valve body in this invention;

[0028] Figure 10 This is a three-dimensional schematic diagram of the pressure cap in this invention;

[0029] Figure 11 This is a three-dimensional schematic diagram of the first sealing element in this invention. Detailed Implementation

[0030] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0033] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0034] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0035] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0037] Traditional high-temperature valves, when handling ultra-high-temperature media, especially in biomass gasification plants, face severe challenges due to the media temperatures reaching up to 800°C, far exceeding the industry-defined 650°C limit for high-temperature valves. Existing cooling methods are ineffective in preventing high-temperature leakage from the valve body, cover, and connecting seals, significantly impacting the long-term safety and reliability of the valves. For example, in a biomass pressurized gasification plant requiring precise control of syngas at 800°C, traditional high-temperature valves would expose their internal structures and seals to extreme temperatures for extended periods, making them highly susceptible to material creep, seal failure, and even media leakage. This not only jeopardizes production safety but also limits the widespread application of this novel gasification process. Without addressing these issues, ultra-high-temperature valves will fail to meet the stringent safety and reliability requirements of industrial production, hindering the further development and application of related high-temperature processes.

[0038] In this regard, such as Figures 1 to 11As shown in the figure, this specification provides an ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device, including a valve body 1 and a valve cover 2. It should be understood that the ball valve also includes a ball, valve stem, stuffing box, etc., which will not be detailed here. A first cooling channel 3 is provided inside the valve body 1, and a second cooling channel 4 is provided inside the valve cover 2. Specifically, the valve body 1 is the main body of the ball valve, and its internal structure is designed to withstand high-temperature and high-pressure media. To achieve effective cooling, the valve body 1 has a first cooling channel 3 inside. This first cooling channel 3 can be designed as an annular channel, a spiral channel, or multiple straight channels, and its specific shape and size can be optimized according to the valve's operating temperature, media flow rate, and required cooling effect. For example, the first cooling channel 3 can be arranged along the inner wall of the valve body 1 or in key heated areas to maximize heat exchange efficiency.

[0039] The valve cover 2 is connected to the valve body 1, together forming the main structure of the valve. Similar to the valve body 1, the valve cover 2 also has a second cooling channel 4 inside. This second cooling channel 4 cooperates with the first cooling channel 3 to form part of the cooling circuit. The design of the second cooling channel 4 can also take various forms, such as annular, spiral, or multiple straight channels, to ensure that the cooling medium can flow sufficiently through the key heat-receiving areas of the valve cover 2.

[0040] Preferably, there are multiple first cooling channels 3 and second cooling channels 4, and the number of channels is the same.

[0041] A first sealing element 5 is provided between the valve body 1 and the valve cover 2 to prevent internal medium leakage. However, in this application, the first sealing element 5 is provided with a first channel 50 connecting the first cooling channel 3 and the second cooling channel 4. The number and position of the first channel 50 can be adjusted according to the structure of the first sealing element 5, the number of cooling channels and cooling requirements. For example, multiple evenly distributed through holes can be provided to ensure that the cooling medium can flow evenly through the first sealing element 5, thereby effectively reducing the temperature of the key sealing area and preventing sealing failure caused by high temperature.

[0042] In order to introduce and discharge the cooling medium, the valve body 1 is provided with an inlet flange 6 that communicates with the first cooling channel 3, and the valve cover 2 is provided with an outlet flange 7 that communicates with the second cooling channel 4. The number of inlet flange 6 and outlet flange 7 can be one or more.

[0043] The inlet flange 6, the first cooling channel 3, the first passage 50, the second cooling channel 4, and the outlet flange 7 are sequentially connected to form a cooling circuit. This means that the cooling medium enters the first cooling channel 3 from the inlet flange 6, then enters the second cooling channel 4 through the first passage 50 on the first seal 5, and finally exits from the outlet flange 7. A cooling circulation device is installed between the inlet flange 6 and the outlet flange 7. Throughout the process, the cooling medium continuously circulates, efficiently carrying away heat from the valve body 1, valve cover 2, and the area of ​​the first seal 5, thereby maintaining the temperature of these components within a safe operating range. This allows the valve to maintain its structural integrity and sealing performance even under ultra-high temperature conditions.

[0044] In particular, the first seal 5 is also involved in the cooling circuit, thereby achieving effective cooling of the key parts of the valve and significantly improving the safety and reliability of the valve in ultra-high temperature environments.

[0045] The existing cooling method of adding a cooling water jacket to the outside of the valve body can cool the valve body to a certain extent, but its main drawback is that the original flange size must be increased to accommodate the jacket structure. This not only greatly increases the overall size and weight of the valve, but also significantly increases the manufacturing cost. More importantly, the cooling medium is far from the medium channel, resulting in reduced cooling effect and failure to cool critical seals. In contrast, the valve body 1 described in this application has an inlet channel 100, the valve cover 2 has an outlet channel 200, the inlet channel 100 has an inlet heat insulation sleeve 8, and an inlet chamber 9 communicating with the first cooling channel 3 is formed between the two. The outlet channel 200 has an outlet heat insulation sleeve 10, and an outlet chamber 11 communicating with the second cooling channel 4 is formed between the two. Specifically, the inlet channel 100 of the valve body 1 has a first annular groove 12, the outlet channel 200 of the valve cover 2 has a second annular groove 13, the two sides of the inlet heat insulation sleeve 8 and the two sides of the first annular groove 12 are welded to form a seal, and the two sides of the outlet heat insulation sleeve 10 and the two sides of the second annular groove 13 are welded to form a seal. In this way, by carving annular grooves in the valve body 1 and valve cover 2 to create cooling chambers, and by using heat insulation sleeves to isolate the high-temperature medium from contact with the thinned valve body and valve cover walls, not only is the original external dimensions of the valve not changed, but the heat transferred to the valve body and valve cover is also reduced.

[0046] Importantly, the inlet channel 100 wraps around the outlet channel 200 in a ring, and the outlet insulation sleeve 100 wraps around the inlet channel 200 in a ring, increasing the cooling area and thus improving the cooling efficiency.

[0047] Secondly, a seal is formed by welding to ensure the reliability and tightness of the connection.

[0048] In some preferred embodiments, a pressure cap 14 connected to the valve body 1 is further included. A second sealing element 15 is provided between the pressure cap 14 and the valve body 1. A third cooling channel 16 is provided on the pressure cap 14 along its axial direction. A second channel 17 is provided on the second sealing element 15. The second channel 17 is used to connect the first cooling channel 3 with the third cooling channel 16 and the second cooling channel 4 with the third cooling channel 16. The third cooling channel 16 can also be annular, spiral, or multiple straight channels to maximize the contact area between the cooling medium and the inner wall of the pressure cap 14, thereby improving the heat exchange efficiency.

[0049] Generally, the gland 14 is bolted to the valve body 1 and a reliable seal is provided by a second seal 15, such as a metal ring seal. Therefore, in this application, the third cooling channel 16 and the second channel 17 further enhance the effective cooling of the valve stem area on the basis of the original cooling circuit, significantly improving the sealing reliability and long-term stability of the ball valve under extreme operating conditions.

[0050] In some of the embodiments described above in this application, although cooling channels are provided to cool the valve body 1, valve cover 2 and gland 14, under ultra-high temperature conditions, relying solely on simple cooling channels may not be sufficient and uniform to remove all the heat generated by key components such as the valve body 1, valve cover 2 and gland 14. Especially in areas with high local heat load, there may still be a risk of heat accumulation, which may affect the long-term stable operation and sealing performance of the valve.

[0051] It is understood that the first cooling channel 3, the second cooling channel 4, the third cooling channel 16, and the first channel 50 are all obtained by drilling through holes in the valve body 1, the valve cover 2, the gland 14, and the first sealing element 5. The through holes are interconnected, and the number of through holes can be set according to the valve specifications and media conditions. In this application, the valve body 1 has a first annular groove 18 connected to the first cooling channel 3 on the connecting side facing the valve cover 2; the valve cover 2 has a second annular groove 19 connected to the second cooling channel 4 on the connecting side facing the valve body 1; the valve body 1 has a third annular groove 20 connected to the first cooling channel 3 on the connecting side facing the gland 14; and the gland 14 has a fourth annular groove 21 connected to the third cooling channel 16 on the connecting side facing the valve body 1. By setting the circulating water flow annular grooves, the contact area with the cooling medium is maximized, the convection flow of the cooling medium is accelerated, and the cooling effect on the sealing element is particularly improved.

[0052] The first sealing element 5 and the second sealing element 15 both include a sealing ring portion 1500 and a flange portion 1501 formed by the outer ring and inner ring of the sealing ring portion 1500. The first annular groove 18, the second annular groove 19, the third annular groove 20 and the fourth annular groove 21 are all mated to form an installation cavity that is adapted to the sealing ring portion 1500. The flange portion 1501 is pressed between the valve body 1 and the valve cover 2 or between the valve body 1 and the gland 14, which improves the stability and sealing reliability of the sealing element. If only the traditional O-ring sealing structure is used, it is easy to misalign with the corresponding cooling channel, affecting the flow of the cooling medium.

[0053] Preferably, the first sealing element 5 and the second sealing element 15 are irregularly shaped metal sealing elements rather than standard metal rings. The two sides of the sealing ring portion 1500 can be set as conical surfaces or spherical surfaces to achieve a line seal between the valve body 1 and the valve cover 2 or between the valve cover 2 and the pressure cap 14. Several small holes are provided on the plane between the conical surface and the spherical surface. The small holes are through holes and are paired and connected with the first cooling channel 3 of the valve body 1, the second cooling channel 4 of the valve cover 2, and the third cooling channel 16 of the pressure cap 14. This achieves a continuous cooling channel formed by the valve body 1, the valve cover 2, the pressure cap 14, the inlet chamber 9, and the outlet chamber 11, maximizing the uniform, stable, and continuous cooling of the valve body 1, the valve cover 2, the pressure cap 14, and related key internal components.

[0054] Preferably, the cross-section of each annular groove is trapezoidal, which, when combined with the sealing ring portion 1500, can form a reliable seal.

[0055] Preferably, such as Figure 6 and Figure 7 As shown, a certain gap is provided between the sealing ring portion 1500 and the bottom of the corresponding annular grooves on both sides to allow coolant to fill, thereby accelerating the convection flow of the cooling medium and especially improving the cooling effect on the seal.

[0056] In some embodiments, an inlet valve seat assembly disposed within the valve body 1 is further included. The inlet valve seat assembly includes an inlet valve seat 22, a protective ring 23, and a disc spring 24. The protective ring 23 is disposed between the circumferential outer wall of the inlet valve seat 22 and the circumferential inner wall of the valve body 1. A first sealing plane 2200 is provided at the end of the inlet valve seat 2 away from the valve cover 2. A second sealing plane 101 is provided on the valve body 1 corresponding to the first sealing plane 2200. The disc spring 24 abuts between the valve body 1 and the inlet valve seat 22 and is located in the inner ring of the first sealing plane 2200 and the second sealing plane 101. The disc spring 24 provides preload while forming an isolation between the inlet valve seat end and particulate dust media. The protective ring 23 further forms an isolation between particulate dust media that may be present under reverse pressure, protecting the high cleanliness and long-term sealing performance of the first sealing plane 2200 and the second sealing plane 101.

[0057] A certain gap is provided between the circumferential outer wall of the inlet valve seat 22 and the circumferential inner wall of the valve body 1. That is, the circumferential outer wall of the inlet valve seat 22 and the circumferential inner wall of the valve body 1 are not fitted with relevant tolerance zones. The size of the gap is set according to the dimensional changes of thermal expansion and contraction of the material, so as to prevent the inlet valve seat from being seized by the valve body under high temperature or temperature difference.

[0058] In some embodiments, an outlet valve seat assembly disposed within the valve cover 2 is further included. The outlet valve seat assembly includes a fixed valve seat 25, a pressure plate 26, and a screw 27. The pressure plate 26 presses the fixed valve seat 25, and the screw 27 passes through the pressure plate 26 to fix the fixed valve seat 25 to the valve cover 2. The end of the fixed valve seat 25 away from the valve body 1 is provided with a third sealing plane 2500. The valve cover 2 is provided with a fourth sealing plane 201 that seals with the third sealing plane 2500. The third sealing plane 2500 and the fourth sealing plane 201 are tightly attached and fit together to seal under the fixation of the pressure plate 26 and the screw 27.

[0059] To prevent the threads from loosening under high temperatures, the head of the screw 27 is welded to the pressure plate 26 to ensure that the valve seat 25 and the valve cover 2 remain as a whole at all times.

[0060] In some embodiments, the valve cover 2 is provided with a drain screw sleeve 28 that communicates with the second cooling channel 4. The drain screw sleeve 28 is internally threaded with a screw plug 29. A gasket 30 is provided between the screw plug 29 and the drain screw sleeve 28 to enhance the sealing effect and prevent the medium from leaking from the threaded connection. The material is usually selected to be a material with good elasticity and corrosion resistance, such as rubber, asbestos or metal.

[0061] This setup allows for the timely removal of cooling medium or condensate from the cooling circuit when the ball valve stops.

[0062] Furthermore, the inlet heat insulation sleeve 8, outlet heat insulation sleeve 10, ball and valve seat assembly that are in direct contact with the high-temperature medium in the valve flow channel are all made of special alloys that can withstand high temperatures for a long time. Other non-contact parts, including the valve body and valve cover, can be made of ordinary heat-resistant stainless steel, which greatly reduces material costs while ensuring safety and reliability.

[0063] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0064] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0065] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A high-temperature metal-sealed ball valve for a biomass pressurized gasification device, comprising a valve body and a valve cover connected together, characterized in that, The valve body is provided with a first cooling channel, the valve cover is provided with a second cooling channel, and a first sealing element is provided between the valve body and the valve cover. The first sealing element is provided with a first channel connecting the first cooling channel and the second cooling channel. The first sealing element is made of metal and includes a sealing ring portion and a flange portion formed by the outer ring and inner ring of the sealing ring portion. The flange portion of the first sealing element abuts against the valve body and the valve cover. The valve body is provided with an inlet flange communicating with the first cooling channel, and the valve cover is provided with an outlet flange communicating with the second cooling channel. The inlet flange, the first cooling channel, the first channel, the second cooling channel and the outlet flange are sequentially connected to form a cooling circuit.

2. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 1, characterized in that, The valve body is provided with an inlet channel, the valve cover is provided with an outlet channel, the inlet channel is provided with an inlet heat insulation sleeve, and an inlet chamber communicating with the first cooling flow channel is formed between the two, and the outlet channel is provided with an outlet heat insulation sleeve, and an outlet chamber communicating with the second cooling flow channel is formed between the two.

3. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 2, characterized in that, The valve body has a first annular groove at its inlet channel and a second annular groove at its outlet channel. The two sides of the inlet heat insulation sleeve and the two sides of the first annular groove are welded together to form a seal, and the two sides of the outlet heat insulation sleeve and the two sides of the second annular groove are welded together to form a seal.

4. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 1, characterized in that, It also includes a pressure cap connected to the valve body, a second sealing element is provided between the pressure cap and the valve body, a third cooling channel is provided on the pressure cap along its axial direction, and a second channel is provided on the second sealing element, the second channel being used to connect the first cooling channel and the third cooling channel and the second cooling channel and the third cooling channel.

5. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 4, characterized in that, The valve body has a first annular groove on the connecting side facing the valve cover that communicates with the first cooling channel, and the valve cover has a second annular groove on the connecting side facing the valve body that communicates with the second cooling channel.

6. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 5, characterized in that, The valve body has a third annular groove on the connection side facing the gland, which communicates with the first cooling channel, and the gland has a fourth annular groove on the connection side facing the valve body, which communicates with the third cooling channel.

7. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 6, characterized in that, The second seal is the same as the first seal, including a sealing ring portion and a flange portion formed by the outer ring and inner ring of the sealing ring portion. The flange portion of the second seal abuts between the valve body and the gland. The two sides of the sealing ring portion are set as conical surfaces or spherical surfaces. The first annular groove, the second annular groove, the third annular groove and the fourth annular groove are all matched to form an installation cavity that is adapted to the sealing ring portion and form a line seal therewith.

8. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 1, characterized in that, It also includes an inlet valve seat assembly disposed within the valve body. The inlet valve seat assembly includes an inlet valve seat, a protective ring, and a disc spring. The protective ring is disposed between the circumferential outer wall of the inlet valve seat and the circumferential inner wall of the valve body. A first sealing plane is provided at the end of the inlet valve seat away from the valve cover. A second sealing plane is provided on the valve body corresponding to the first sealing plane. The disc spring abuts between the valve body and the inlet valve seat and is located on the inner ring of the first sealing plane and the second sealing plane. A certain gap is provided between the circumferential outer wall of the inlet valve seat and the circumferential inner wall of the valve body.

9. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 1, characterized in that, It also includes an outlet valve seat assembly disposed within the valve cover. The outlet valve seat assembly includes a fixed valve seat, a pressure plate, and a screw. The pressure plate presses the fixed valve seat, and the screw passes through the pressure plate to fix the fixed valve seat to the valve cover. Its head is welded to the pressure plate. The end of the fixed valve seat away from the valve body is provided with a third sealing plane, and the valve cover is provided with a fourth sealing plane that seals with the third sealing plane.

10. The ultra-high temperature metal-sealed ball valve for a biomass pressurized gasification device according to claim 1, characterized in that, The valve cover is provided with a drain screw sleeve that communicates with the second cooling channel. The drain screw sleeve is internally threaded with a screw plug, and a gasket is provided between the screw plug and the drain screw sleeve.

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